Hammer



FIG. 1 is a perspective view of our new design.

FIG. 2 is a front view thereof.

FIG. 3 is a back view thereof.

FIG. 4 is a right side view thereof.

FIG. 5 is a left side view thereof.

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines depict portions of the hammer in which the design is embodied that are not considered part of the claimed design. 

CLAIM The ornamental design for a hammer, as shown and described. 